Governor for electric motors



(No Model.)

J. MARTY, Jr. GOVERNOR FOR ELECTRIC MOTORS.

No. 511,347. Patented Dec. 26, 1893.

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JOHN MARTY, JR., OF CLEVELAND, OHIO.

GOVERNOR FOR ELECTRIC MOTORS.

SPECIFICATION forming part of Letters Patent No. 511,347, dated December 26, 1893.

Application filed October 10, 1892. Serial No. 448,489. (No model.)

To to whom it may concern:

Be it known that I, JOHN MARTY, J12, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, State of Ohio, have invented certain new and useful Improvements in Governors for Electric Motors, of which the following is a specification.

This invention relates to governors for electric motors and consists in the new constructions and combinations substantially as hereinafter described and pointed out in the claims.

In the accompanying drawing the figure is a top view of a commutator, and part of an armature, showing my new arrangement of the bars or sections in the surface of the commutator, and the combination and arrangement therewith of a governor and brush adgusting mechanism operated thereby.

A represents a commutator in the periphery of which are seen the bars or sectional terminals of the armature wires, B, a short portion of which only is shown. Instead of carrying out the bars or sections on the commutator in straight lines parallel with the axis of the armature, I arrange them on lines dlagonal to the said axial line, to a greater or less degree as may be desired, the object and purpose of which will be hereinafter explained and shown.

C is one of the supports and bearings of the armature shaft, S. The shaft is prolonged and extends considerably beyond the bearing for the purpose of carrying a governor G, and a brush carrying frame, constructed and applied in the following manner:

9 is a loose sleeve on the shaft to which the links, Z, Z, are pivoted.

I is a second tight sleeve on the shaft to which the weighted angle levers, L, L, are pivoted, at their angles, and having their outwardly extending arms pivotally attached to the said links, Z, Z.

K is a spring having its ends attached to the weighted ends of the said levers L L, and 1s employed for forcing these ends of the levers inward.

M is a cross-bar of the brush holding frame, and is set and supported on the loose sleeve 9. Said sleeve revolves in the cross-bar and is provided with ball bearings to reduce friction.

N 18 a second cross-bar set and supported on the end of the shaft bearing 0, also having ball bearings.

R, R, are brush holding rods, one end of each of which is secured to the ends of crossbar M. The other ends of said rods pass loosely through the ends of cross bar N, and extend to the sides of the commutator, and carry the brushes.

T, T, are clamps for holding the brushes, and are fixed on the ends of the rods in a twisted position so as to hold the brushes on the commutator in conformityto the diagonal lines of the commutator bars.

V is a slotted arm fixed onto the cross-bar M in a diagonal position conforming to the position of the brushes, and \V is a pin fixed on the support 0 extending up through the 7 slot in said arm V. This is designed as a guide for carrying the frame and moving the brushes in a spiral direction on the commutator, as they are actuated by the movements of the governor.

The workings of this device are as follows: When the brushes are near the end of the commutator, it will be seen that the currents of electricity will be conducted around and at a side away from the brush contacts, and that the positions of such currents are relatively different to the poles of the field magnets to those in a commutatorhaving its bars or sections parallel with its axis. Now as the governor expands the brushes are moved inwardly and around on the commutator, thereby making their contact relatively more direct with the armature coils, and changing the position of the currents relative to the field centers. This changing of the currents away from the field centers weakens the magnetic force upon the armature and thereby tends to re duce the speed, so that a motor provided with my improvement is made much more sensitive to magnetic power and is under perfect control, resulting in uniformity and steadi ness of motion.

The arrangement of the governor and the means of connecting same to operate the brushes may be varied in construction without materially changing the essential features of my invention. I do not therefore confine myself to the construction shown.

What I claim, and desire to secure by Leters Patent, is-

no clamps T T to moving ends of rods R R; di-

agonal slotted arm V fixed on cross-bar M, and guide pin W on bearing 0 extending through slot in arm V, all constructed to opcrate substantially as described.

2. In an electric motor the combination of an armature provided with commutator having sections constructed and arranged on diagonal lines to its axis; abrush holding frame consisting of cross bar M, mounted on sleeve g on the armature shaft, brush rodsR R fixed to the ends of cross bar M and loosely supported in the ends of crossbar N mounted on shaft bearing 0, slotted arm V, diagonally fixed on cross bar M and playing over pin W on bearing 0, and governor G attached to sleeve 9 and mounted on armature shaft, constrncted and arranged to operate substantially as described and for the purpose specified. JOHN MARTY, JR.

Witnesses:

GEO. W. TIBBITTS, E. J AY PINNEY. 

